Ambiguity in the Oregon Treaty leads to the "Northwestern Boundary Dispute" between American and British/Canadian settlers.

Pig War (1859)

Border dispute between the United States and the United Kingdom

The Pig War was a confrontation in 1859 between the United States and the United Kingdom over the British–U.S. border in the San Juan Islands, between Vancouver Island and the Washington Territory. The Pig War, so called because it was triggered by the shooting of a pig, is also…